Another RF amplifier that I like to build and slip into the 1947 Collins 30K-1 cabinet. The cabinet contains the power supply, control circuits for filament and high voltage, Pi output network consisting of a large roller inductor and vacuum capacitors. RF output of this amplifier into a 50 ohm dummy load is approximately 1400 watts.
![](https://i.ytimg.com/vi/k9nsRZKvLtg/maxresdefault.jpg)